In the Naruto community, most fans create fanfiction that revolves around adventure, growth of the characters, and their relationships in a positive light. The idea of 'naruto gets raped by girls' goes against the spirit of the series and the values it represents. So, no, there should be no such fanfiction in a healthy Naruto - related fan community.
In fanfic, the concept of ethics can be quite complex. From a general moral standpoint, getting a girl pregnant at a young age as might be the case in a 'Harry gets girls pregnant fanfic' is often considered unethical in real - world values. However, in the realm of fanfic, it's a fictional exploration. Some might argue that it's a way to explore different storylines and character developments, but it still might make some readers uncomfortable given the serious nature of the topic.
Perhaps it was a weapon created by a rogue ninja with unique powers. And for some reason, it found its way to Naruto in Wave. It might also be a weapon that was enchanted by a sorcerer long ago and has special abilities that Naruto will discover as he uses it.
Don't engage with it further. Instead, focus on the vast amount of positive Naruto fanfiction out there. There are many great stories that explore the characters' development, their battles, and their emotional bonds in a healthy and respectful way. You can also join fan groups that are dedicated to positive Naruto content creation and discussion, and help spread the word that this kind of inappropriate content has no place in the Naruto fandom.
There was no specific information provided to answer this question regarding the girl in Zhou Chu San Xu. Therefore, I don't know the details of the girl who got rid of the three pests.
On the positive side, new and better policies could be implemented. If the old council was corrupt or stagnant, getting rid of them would open the door for fresh ideas and reforms. Naruto could bring in new people with different perspectives to help run the village, leading to a more prosperous and fair Konoha.
His teammates, Sasuke and Sakura, would surely be involved. Sasuke, although he may not show it as much, still cares about Naruto. He would keep an eye on Naruto's condition, and if there was any sign of danger, he would be ready to protect him. Sakura would be more hands - on with the medical care, checking his temperature, giving him medicine, and making sure he rests properly.
One possible scenario in this fanfiction could be that Naruto's sister constantly interferes in his ninja training. She might think the training is too dangerous for him and tries to stop him from taking on challenging missions. For example, when Naruto is about to go on a mission to the Land of Waves, his sister could try to convince the Hokage not to send him, believing that he's not ready yet. This would add a whole new layer of conflict to the story, not just between Naruto and his sister, but also with the village's expectations of Naruto as a ninja.
A fanfiction about Naruto getting the Kusanagi could also involve a time - travel aspect. Naruto could be sent back in time and end up in the era when the Kusanagi was first created. There, he meets the original wielder and learns from them. He then brings the knowledge and the sword back to his own time, using it to defeat a great evil that was previously unbeatable.